i need a new parts for my delta...

I wasnt sure where to ask this, so i thought that this would be the best place. Well while i was over my friedns house last night my brother had some of his friends come over and they got into my paintball stuff . When i came home i found that paintballs and were fired off all around the house and 12grams were everywhere. When i went to go check on my pistol i saw that the part (its like a screw with a very wide flat head) that pushes in the 12grams was bent inward a lot. So i tried to fix it and it snapped right off.

I looked for a place to buy it and i could not find it anywhere. I found out that it is part 19. Does anybody know where i can get this or should i talk to psyco balistics?